Scenario 1:

a) The app currently does not support built-in push notifications. Users responsible for approvals should receive notifications directly within the app.

b) Similarly, when an expense is rejected, the submitter should be notified and be able to view the comments explaining the reason for the rejection within the application.

Scenario 2:

a) Currently, the app does not support attaching multiple images or files to an expense. This functionality should be added.